Cooper pair splitting in diffusive magnetic SQUIDs

We study Josephson junctions with weak links consisting of two parallel disordered arms with magnetic properties: ferromagnetic, half-metallic, or normal with magnetic impurities. In the case of long links, the Josephson effect is dominated by mesoscopic fluctuations. In this regime, the system real...

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Bibliographic Details
Published in:Physical review. B 2017-03, Vol.95 (9), p.94508, Article 094508
Main Authors: Ioselevich, P. A., Ostrovsky, P. M., Fominov, Ya. V., Feigel'man, M. V.
Format: Article
Language:English
Subjects:
Cooper pairs
Critical current (superconductivity)
Dependence
Ferromagnetism
Josephson effect
Josephson junctions
Links
Magnetic properties
Periodic variations
Quantum theory
Splitting
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Summary:We study Josephson junctions with weak links consisting of two parallel disordered arms with magnetic properties: ferromagnetic, half-metallic, or normal with magnetic impurities. In the case of long links, the Josephson effect is dominated by mesoscopic fluctuations. In this regime, the system realizes a φ0 junction with sample-specific φ0 and critical current. Cooper pair splitting between the two arms plays a major role and leads to 2Φ0 periodicity of the current as a function of flux between the arms. We calculate the current and its flux and polarization dependence for the three types of magnetic links.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.95.094508